Stock-Based Compensation - Stock option activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019
Number of Options
Beginning balance (in shares)	37,155,568
Exercised (in shares)	(5,985,471)
Forfeited (in shares)	(2,747,157)
Ending balance (in shares)	28,422,940	37,155,568
Options exercisable (in shares)	24,230,278
Options vested and expected to vest (in shares)	27,877,806
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 11.39
Exercised (in dollars per share)	7.06
Forfeited (in dollars per share)	14.16
Ending balance (in dollars per share)	12.03	$ 11.39
Option exercisable (in dollars per share)	11.60
Options vested and expected to vest (in dollars per share)	$ 11.98
Additional Information
Weighted-Average Remaining Contractual Term	5 years 7 months 6 days	6 years 3 months 18 days
Option exercisable - Weighted Average Remaining Contractual Term	5 years 2 months 12 days
Options vested and expected to vest - Weighted Average Remaining Contractual Term	5 years 7 months 6 days
Aggregate Intrinsic Value	$ 99,053	$ 94,288
Options exercisable - Weighted Average Intrinsic Value	94,768
Options vested and expected to vest - Weighted Average Intrinsic Value	$ 98,495